First build, only 1 motor spinning properly!

AngelGrinder

New Member
Hi all, first post here, will be sure it won't be the last!

Built my first ever quad this weekend, everythings going well, all ESC's have been calibrated on baseflight, they aren't all firing up exactly at the same time, but are fairly close.

I'm running a Naze32 acro, 4 x Emax Mt2204, and 4 x 12A BLHeli ESC and this is my battery TURNIGY 1300mAh 3S 11.1 v 25c-35c LIPO BATTERY.

So, my problem is, all motors spin fine when doing motor test on baseflight, although as said, the motors are not all starting exactly the same time.

But when I unplug it, attach props and use transmitter to try and take off, only the 2 rear motors are putting out power, the front two are spinning *really* slowly.

I'm not sure what to start troubleshooting first, I can post a video if it helps? Any advice is greatly appreciated, many thanks!

I've seen online that a common problem is the bullet connectors not being soldered well enough or a bad connection, I've stripped the heatshrink and tested with the multimeter and there doesn't seem to be a problem. I was going to try and unsoldering the bullets and soldering the cables directly, but was wondering if there was anything else it could likely be?
 
Welcome to the forums.

If you calibrated the ESCs that should have fixed it. Have props off the motors and run it a little under full (no props can cause it to burn out the motor for running too fast) for a few seconds. Then disarm it and check the joints to see if any are abnormally hot. If they are then you have a lot of resistance, and may need to reflux and re heat the solder joint.
 
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